Double-acting press



(NQ) Model.) 4 sheets-sheet 1.

A. C. CAMPBELL. DOUBLE ACTING PRESS'.

No. 526,892. 'Patented Oct. 2, 18911..

.Flllll mi NoRms Ferias co.. mofmvmo. wAsmNaTon, ny c4 wlTN-Essfs: I

4 'Sheets-Sheet 3.

(No ModeL) A o CAMPBELL l DOUBLE ACTING PRESS. No. 526,892.

Z). IN- mips Patented Oct. 2, 1894.

wlTNEssES:

'ATTORNEY (No Modem A C OAMPBELL DOUBLE ACTING PRESS.

Patentedoct.- 2, y. N Fmi?,

wlTNEssEs: I I @@@w Vmul/amos ATTORNEY n ffUNITED STATES PATENT OFFICE.-

f time for the insertion of the blank or sheet,

, tion taken in the plane indicated by the line ANDREW C.y CAMPBELnoF WATERBURY, CONNECTICUT.

DOUBLE-ACTING PRESAS.

SPECIFICATION forming part of Letters Patent No. 526,892, dated October 2, 1,894. Appncsetumea .im 4,1894. serial No. 513,350. (Nt'moaem VTo all whom it may concern:

13e it known that LANDREW C. CAMPBELL, a citizen of the United States, residing in Wa- =terbury, New Haven county, Connecticut, yhave invented certain .new and useful Improvements in Double-Acting Presses, of

the purpose of clamping down'the margin of the blank or sheet, while the'drawingslide,` punch, or upper die isk operating, and it is desirable that the movements of the blank- Iholder shall be intermittent; that is, there shall be a dwell, or cessation of movement, at the respective ends of its stroke. The dwell at the upper terminus of the stroke allows and that at the lower terminus of its stroke permits the die to operate while the blank or sheet is being firmly held. It is desirable, also to effect this operation of the blankholder with as little friction as possible and consequently with as littlev loss of possible. y

To this end the object of my invention is to. provide a press with mechanism for reciprocating the upper die or punch, and a novel; mechanism, operating in unison withthe die operating mechanism, for imparting the proper non-continuous reciprocating motion to the blank-holder.

The invention will be fully described` here-vv inafter and its novel features carefully defined in the claims.

In the accompanying. drawings-Figure 14 is an elevation of the left-hand side of a press vertical section taken in the plane indicated by line in Fig. 2, illustrating the mechanism whereby the upper die, drawing slide, or punch is actuated. Fig. 4 is a vertical secpower, asi

rying the blfftnk-holler.A Fig. 5 is a horizontal sectiontakenin the plane of the axis of the main driving shaft. Fig. 6' is a horizontal section through the'upper die or drawing slide and the guides of the gate carrying the blankholder, showing the gate in plan. Fig. 7 is a diagram showing the relative movements of anism is herein constructed and proportioned. 1,' is a suitable strong'frame, which may have any desired contour. Usually it will be made of cast iron. n rv 12 is the main driving shaft, mounted in bearings in the frame and provided with a driving wheel or pulley, 3. In the shaft 2is formed a crank,4, to which is coupled at its upper end, a connecting-rod, 5. At its lower .theblank-holder and upper die, as the mechend the rod 5 has a ball-and-socket coupling to the upper die, punch, or drawing slide, 6. This construction is best seen in Fig. 3. The

die 6 is guided in and plays through a gate,y

7, mounted to reciprocate in guides, S, on the frame. This gate 7 carries the blank-holder, 9. Indeed the gate and blank-holder might be integral if desired.

Mounted in the frame above the main shaft 2, is a crank-shaft, 10, in which are formed two cranks, 11;. and to these cranks are cou-y zpled, respectively, two like connecting-rods or links, 12, which are coupled at their lower ends to the gate 7. This construction is best seen in Fig. 4. In order to pass the main shaft 2, the link 1'2'is widened and basin it an ap# erture through which the shaft 2 passes; and

for convenience in mounting the link 12 after the main shaft is in place, a way or gate is cut or formed inthe ring-like, widened part of. the link, said gate being broad enough to admit the main shaft, and this gate or way is afterward filled by a block, 13 (see Fig.` 4) and secured by a bolt, 14. The links 12, aswell as the connecting-rod 5, are madeadjustable as to length by screws in a well known'way. On the bed of the frame ismounted the lower die, 15. '5

I will now describe the mechanism whereby continuous rotation of the main driving-shaft 2, imparts non-continuous or intermittent ro` --tary motion to the crank-shaft l0, which latter operates the blank-holder. This mechanism` is best seen in Figs. 1, 2 and 5, and I will describe it as proportioned herein, premising that these proportions may be varied.

On the crank-shaft lO, is fixed a gear-wheel, 16, having twenty teeth, which gears with a wheel, 17, having fty teeth. This Wheel 17 rotates about a stud, 18, projecting from the frame. Fixed to the outer face of the gearwheel 17, is a disk, 19, having in it five, equally spaced radial slots, 20, the peripheries of the segments between said slots being concave, as shown. On the outer end of the main shaft 2, and beyond the plane of the disk 19, is fixed a disk, 21, which bears on its inner face two studs, 22. These will be roller studs by preference and they are adapted, as the main shaft rotates, to enter the radial slots 2O and impart to the disk 1-9 intermittent rotary impulses. These impulses being communicated to the cam-shaft 10, through the intermediate gears, 16 and 17, will impart to the shaft 10 intermittent half-rotations, with a dwell or rest when the cranks in shaft 10 are up and another dwell or rest when the said cranks are down.

Fig. 1 shows the positions of the parts when the cranks in shaft 10 have reached the end of their downward stroke. The lower stud 22 is just leaving a slot 20. The upper stud 22...

has yet some distance to travel before it can enter the next succeeding slot 2O and again set the shaft 10 to rotating. As the gearing is here shown each stud 22 turns the wheel 17 through one-fifth of a complete rotation, and the wheel 17 turns the wheel 16, at the same time through one-half of a complete rotation. The proportions of the disks 19 and 21 are such that after one stud 22 ceases to operate the disk 19, the main shaft 2 will rotate through about eighty degrees before the next stud 22 comes into operation. These relations Inay be varied by varying the proportions of the elements described.

In order to hold the crank-shaft 10 against accidental movement during the periods of rest, or in other words to provide it with a positive stop, I iix on the main shaft 2, at the inner face of the disk 21, and in the same plane as the disk 19, a stop-disk 23, having two oppositely arranged convex faces which engage in turn the concave faces on the disk 19 and lock the latter against rotation. This stop device (seen in dotted lines in Fig. 1) is not of itself new, being similar to the well known Geneva stop used in watch movements.

In order to make more clear the relative movements of the upper die and the blankholder, I have represented them diagrammatically in Fig. 7, wherein the vertical lines designate the degrees moved through by the cranks, and the horizontal lines the limits of the strokes of the cranks. The curved line 24 represents the movement of the die and 'the partly curved and partly straight line 25, represents the movement of the blank-holder,

the straight portions indicating the dwells or rests.

The gearing and disks last described for operating the blank-holder may be inclosed in a housing or guard, 26, secured to the frame. In Fig. 1 this guard isY represented broken away and it is omitted from Fig. 2.

I have used the term die for the part 6, but this is sometimes called a drawing slide or punch, as the case may be. The gate 7 is merely the carrier for the blank-holder 9 and these two parts may be considered as one.

It willbe seen that the object of mechanism intermediate the driving shaft 2 and camshaft 10 is to convert the continuous rotatory motion of the former into intermittent halfrotations of the latter, the intermittent impulses being alternated with rests; and this might be effected by some other form of gearing or train intermediate the continuously rotating shaft 2 and the intermittently rotating shaft 10. I do not therefore wish to limit myself to the specific intermediate gearing herein shown.

Having thus described my invention, I claim- 1. In a press of the character described, the combination with the dies and the rotating main shaft from which the moving die is driven, of the reciprocating gate provided with the blank-holder, the crank-shaft l0, connections between the gate and said crankshaft whereby rotation of the latter imparts a reciprocatory movement to the former, and intermediate driving and converting mechanism between the main shaft and the crankshaft for converting continuous rotary motion of the former into intermittent rotary motion of the latter, substantially as set forth.

2. In apress of the character described, the combination with the' dies and the rotating main shaft from which the moving die is driven, of the reciprocating gate provided with the blank-holder, the crank-shaft 10, the connections between the gate and said crankshaft whereby rotation of the latter imparts a reciprocatory movement to the former, a rotatable, radially slotted disk 19, studs 22, carried by the main shaft and adapted to engage the slots in the disk 19 and thus impart intermittent rotary motion to said disk, `and gearing intermediate the disk 19 and shaft 10, whereby the motion of the former is imparted to the latter, substantially as setforth.

3. In a press of the character described, the combination with the main shaft 2, the dies, and the connecting-rod coupling the moving die to the crank in the main shaft, of the crank-shaft 10, the reciprocating gate provided with the blank-holder, a link connection between the crank in the shaft 10 and the gate, the rotatively mounted, radially slotted disk 19, having concaves in its periphery as described,the studs 22, carried by the main shaft and adapted to engage the slots in the disk 19, the stop-disk 23, on the main shaft, and its convex ends adapted to engage the IIO concaves in the disk 19, and gearing between the disk 19 and shaft 10, whereby the former drives the latter intermittently.

4. In a press of the character described, the combination with the gate 7, the crank-shaft lO, and the links connecting the gate with the cranks in said shaft, of a rotatable, radially slotted disk 19, geared to the crank-shaft, and

a continuous rotating disk 21, provided with v :o studs 22, adapted to engage the slots in the disk 19 and impart thereto intermittent rotary impulses alternating with rests, substantially as and for the purposes set forth.

In witness whereof I have hereunto signed my name in the presence of ytwo subscribing 1,5

witnesses.

ANDREW C. CAMPBELL.

Witnesses:

J. M. GALLOND,

GEO. RowBoTToM. 

